Mercurial > hg > truffle
diff src/cpu/ppc/vm/vm_version_ppc.cpp @ 14408:ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
Summary: With this change the HotSpot core build works on Linux/PPC64. The VM succesfully executes simple test programs.
Reviewed-by: kvn
author | goetz |
---|---|
date | Fri, 02 Aug 2013 16:46:45 +0200 |
parents | |
children | 41b780b43b74 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/cpu/ppc/vm/vm_version_ppc.cpp Fri Aug 02 16:46:45 2013 +0200 @@ -0,0 +1,472 @@ +/* + * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. + * Copyright 2012, 2013 SAP AG. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + * + */ + +#include "precompiled.hpp" +#include "assembler_ppc.inline.hpp" +#include "compiler/disassembler.hpp" +#include "memory/resourceArea.hpp" +#include "runtime/java.hpp" +#include "runtime/stubCodeGenerator.hpp" +#include "utilities/defaultStream.hpp" +#include "vm_version_ppc.hpp" +#ifdef TARGET_OS_FAMILY_aix +# include "os_aix.inline.hpp" +#endif +#ifdef TARGET_OS_FAMILY_linux +# include "os_linux.inline.hpp" +#endif + +# include <sys/sysinfo.h> + +int VM_Version::_features = VM_Version::unknown_m; +int VM_Version::_measured_cache_line_size = 128; // default value +const char* VM_Version::_features_str = ""; +bool VM_Version::_is_determine_features_test_running = false; + + +#define MSG(flag) \ + if (flag && !FLAG_IS_DEFAULT(flag)) \ + jio_fprintf(defaultStream::error_stream(), \ + "warning: -XX:+" #flag " requires -XX:+UseSIGTRAP\n" \ + " -XX:+" #flag " will be disabled!\n"); + +void VM_Version::initialize() { + + // Test which instructions are supported and measure cache line size. + determine_features(); + + // If PowerArchitecturePPC64 hasn't been specified explicitly determine from features. + if (FLAG_IS_DEFAULT(PowerArchitecturePPC64)) { + if (VM_Version::has_popcntw()) { + FLAG_SET_ERGO(uintx, PowerArchitecturePPC64, 7); + } else if (VM_Version::has_cmpb()) { + FLAG_SET_ERGO(uintx, PowerArchitecturePPC64, 6); + } else if (VM_Version::has_popcntb()) { + FLAG_SET_ERGO(uintx, PowerArchitecturePPC64, 5); + } else { + FLAG_SET_ERGO(uintx, PowerArchitecturePPC64, 0); + } + } + guarantee(PowerArchitecturePPC64 == 0 || PowerArchitecturePPC64 == 5 || + PowerArchitecturePPC64 == 6 || PowerArchitecturePPC64 == 7, + "PowerArchitecturePPC64 should be 0, 5, 6 or 7"); + + if (!UseSIGTRAP) { + MSG(TrapBasedICMissChecks); + MSG(TrapBasedNotEntrantChecks); + MSG(TrapBasedNullChecks); + MSG(TrapBasedRangeChecks); + FLAG_SET_ERGO(bool, TrapBasedNotEntrantChecks, false); + FLAG_SET_ERGO(bool, TrapBasedNullChecks, false); + FLAG_SET_ERGO(bool, TrapBasedICMissChecks, false); + FLAG_SET_ERGO(bool, TrapBasedRangeChecks, false); + } + +#ifdef COMPILER2 + // On Power6 test for section size. + if (PowerArchitecturePPC64 == 6) + determine_section_size(); + // TODO: PPC port else + // TODO: PPC port PdScheduling::power6SectorSize = 0x20; + + MaxVectorSize = 8; +#endif + + // Create and print feature-string. + char buf[(num_features+1) * 16]; // max 16 chars per feature + jio_snprintf(buf, sizeof(buf), + "ppc64%s%s%s%s%s%s%s%s", + (has_fsqrt() ? " fsqrt" : ""), + (has_isel() ? " isel" : ""), + (has_lxarxeh() ? " lxarxeh" : ""), + (has_cmpb() ? " cmpb" : ""), + //(has_mftgpr()? " mftgpr" : ""), + (has_popcntb() ? " popcntb" : ""), + (has_popcntw() ? " popcntw" : ""), + (has_fcfids() ? " fcfids" : ""), + (has_vand() ? " vand" : "") + // Make sure number of %s matches num_features! + ); + _features_str = strdup(buf); + NOT_PRODUCT(if (Verbose) print_features();); + + // PPC64 supports 8-byte compare-exchange operations (see + // Atomic::cmpxchg and StubGenerator::generate_atomic_cmpxchg_ptr) + // and 'atomic long memory ops' (see Unsafe_GetLongVolatile). + _supports_cx8 = true; + + UseSSE = 0; // Only on x86 and x64 + + intx cache_line_size = _measured_cache_line_size; + + if (FLAG_IS_DEFAULT(AllocatePrefetchStyle)) AllocatePrefetchStyle = 1; + + if (AllocatePrefetchStyle == 4) { + AllocatePrefetchStepSize = cache_line_size; // need exact value + if (FLAG_IS_DEFAULT(AllocatePrefetchLines)) AllocatePrefetchLines = 12; // use larger blocks by default + if (AllocatePrefetchDistance < 0) AllocatePrefetchDistance = 2*cache_line_size; // default is not defined ? + } else { + if (cache_line_size > AllocatePrefetchStepSize) AllocatePrefetchStepSize = cache_line_size; + if (FLAG_IS_DEFAULT(AllocatePrefetchLines)) AllocatePrefetchLines = 3; // Optimistic value + if (AllocatePrefetchDistance < 0) AllocatePrefetchDistance = 3*cache_line_size; // default is not defined ? + } + + assert(AllocatePrefetchLines > 0, "invalid value"); + if (AllocatePrefetchLines < 1) // Set valid value in product VM. + AllocatePrefetchLines = 1; // Conservative value + + if (AllocatePrefetchStyle == 3 && AllocatePrefetchDistance < cache_line_size) + AllocatePrefetchStyle = 1; // fall back if inappropriate + + assert(AllocatePrefetchStyle >= 0, "AllocatePrefetchStyle should be positive"); +} + +void VM_Version::print_features() { + tty->print_cr("Version: %s cache_line_size = %d", cpu_features(), get_cache_line_size()); +} + +#ifdef COMPILER2 +// Determine section size on power6: If section size is 8 instructions, +// there should be a difference between the two testloops of ~15 %. If +// no difference is detected the section is assumed to be 32 instructions. +void VM_Version::determine_section_size() { + + int unroll = 80; + + const int code_size = (2* unroll * 32 + 100)*BytesPerInstWord; + + // Allocate space for the code + ResourceMark rm; + CodeBuffer cb("detect_section_size", code_size, 0); + MacroAssembler* a = new MacroAssembler(&cb); + + uint32_t *code = (uint32_t *)a->pc(); + // emit code. + void (*test1)() = (void(*)())(void *)a->emit_fd(); + + Label l1; + + a->li(R4, 1); + a->sldi(R4, R4, 28); + a->b(l1); + a->align(CodeEntryAlignment); + + a->bind(l1); + + for (int i = 0; i < unroll; i++) { + // Schleife 1 + // ------- sector 0 ------------ + // ;; 0 + a->nop(); // 1 + a->fpnop0(); // 2 + a->fpnop1(); // 3 + a->addi(R4,R4, -1); // 4 + + // ;; 1 + a->nop(); // 5 + a->fmr(F6, F6); // 6 + a->fmr(F7, F7); // 7 + a->endgroup(); // 8 + // ------- sector 8 ------------ + + // ;; 2 + a->nop(); // 9 + a->nop(); // 10 + a->fmr(F8, F8); // 11 + a->fmr(F9, F9); // 12 + + // ;; 3 + a->nop(); // 13 + a->fmr(F10, F10); // 14 + a->fmr(F11, F11); // 15 + a->endgroup(); // 16 + // -------- sector 16 ------------- + + // ;; 4 + a->nop(); // 17 + a->nop(); // 18 + a->fmr(F15, F15); // 19 + a->fmr(F16, F16); // 20 + + // ;; 5 + a->nop(); // 21 + a->fmr(F17, F17); // 22 + a->fmr(F18, F18); // 23 + a->endgroup(); // 24 + // ------- sector 24 ------------ + + // ;; 6 + a->nop(); // 25 + a->nop(); // 26 + a->fmr(F19, F19); // 27 + a->fmr(F20, F20); // 28 + + // ;; 7 + a->nop(); // 29 + a->fmr(F21, F21); // 30 + a->fmr(F22, F22); // 31 + a->brnop0(); // 32 + + // ------- sector 32 ------------ + } + + // ;; 8 + a->cmpdi(CCR0, R4, unroll);// 33 + a->bge(CCR0, l1); // 34 + a->blr(); + + // emit code. + void (*test2)() = (void(*)())(void *)a->emit_fd(); + // uint32_t *code = (uint32_t *)a->pc(); + + Label l2; + + a->li(R4, 1); + a->sldi(R4, R4, 28); + a->b(l2); + a->align(CodeEntryAlignment); + + a->bind(l2); + + for (int i = 0; i < unroll; i++) { + // Schleife 2 + // ------- sector 0 ------------ + // ;; 0 + a->brnop0(); // 1 + a->nop(); // 2 + //a->cmpdi(CCR0, R4, unroll); + a->fpnop0(); // 3 + a->fpnop1(); // 4 + a->addi(R4,R4, -1); // 5 + + // ;; 1 + + a->nop(); // 6 + a->fmr(F6, F6); // 7 + a->fmr(F7, F7); // 8 + // ------- sector 8 --------------- + + // ;; 2 + a->endgroup(); // 9 + + // ;; 3 + a->nop(); // 10 + a->nop(); // 11 + a->fmr(F8, F8); // 12 + + // ;; 4 + a->fmr(F9, F9); // 13 + a->nop(); // 14 + a->fmr(F10, F10); // 15 + + // ;; 5 + a->fmr(F11, F11); // 16 + // -------- sector 16 ------------- + + // ;; 6 + a->endgroup(); // 17 + + // ;; 7 + a->nop(); // 18 + a->nop(); // 19 + a->fmr(F15, F15); // 20 + + // ;; 8 + a->fmr(F16, F16); // 21 + a->nop(); // 22 + a->fmr(F17, F17); // 23 + + // ;; 9 + a->fmr(F18, F18); // 24 + // -------- sector 24 ------------- + + // ;; 10 + a->endgroup(); // 25 + + // ;; 11 + a->nop(); // 26 + a->nop(); // 27 + a->fmr(F19, F19); // 28 + + // ;; 12 + a->fmr(F20, F20); // 29 + a->nop(); // 30 + a->fmr(F21, F21); // 31 + + // ;; 13 + a->fmr(F22, F22); // 32 + } + + // -------- sector 32 ------------- + // ;; 14 + a->cmpdi(CCR0, R4, unroll); // 33 + a->bge(CCR0, l2); // 34 + + a->blr(); + uint32_t *code_end = (uint32_t *)a->pc(); + a->flush(); + + double loop1_seconds,loop2_seconds, rel_diff; + uint64_t start1, stop1; + + start1 = os::current_thread_cpu_time(false); + (*test1)(); + stop1 = os::current_thread_cpu_time(false); + loop1_seconds = (stop1- start1) / (1000 *1000 *1000.0); + + + start1 = os::current_thread_cpu_time(false); + (*test2)(); + stop1 = os::current_thread_cpu_time(false); + + loop2_seconds = (stop1 - start1) / (1000 *1000 *1000.0); + + rel_diff = (loop2_seconds - loop1_seconds) / loop1_seconds *100; + + if (PrintAssembly) { + ttyLocker ttyl; + tty->print_cr("Decoding section size detection stub at " INTPTR_FORMAT " before execution:", code); + Disassembler::decode((u_char*)code, (u_char*)code_end, tty); + tty->print_cr("Time loop1 :%f", loop1_seconds); + tty->print_cr("Time loop2 :%f", loop2_seconds); + tty->print_cr("(time2 - time1) / time1 = %f %%", rel_diff); + + if (rel_diff > 12.0) { + tty->print_cr("Section Size 8 Instructions"); + } else{ + tty->print_cr("Section Size 32 Instructions or Power5"); + } + } + +#if 0 // TODO: PPC port + // Set sector size (if not set explicitly). + if (FLAG_IS_DEFAULT(Power6SectorSize128PPC64)) { + if (rel_diff > 12.0) { + PdScheduling::power6SectorSize = 0x20; + } else { + PdScheduling::power6SectorSize = 0x80; + } + } else if (Power6SectorSize128PPC64) { + PdScheduling::power6SectorSize = 0x80; + } else { + PdScheduling::power6SectorSize = 0x20; + } +#endif + if (UsePower6SchedulerPPC64) Unimplemented(); +} +#endif // COMPILER2 + +void VM_Version::determine_features() { + const int code_size = (num_features+1+2*7)*BytesPerInstWord; // 7 InstWords for each call (function descriptor + blr instruction) + int features = 0; + + // create test area + enum { BUFFER_SIZE = 2*4*K }; // needs to be >=2* max cache line size (cache line size can't exceed min page size) + char test_area[BUFFER_SIZE]; + char *mid_of_test_area = &test_area[BUFFER_SIZE>>1]; + + // Allocate space for the code + ResourceMark rm; + CodeBuffer cb("detect_cpu_features", code_size, 0); + MacroAssembler* a = new MacroAssembler(&cb); + + // emit code. + void (*test)(address addr, uint64_t offset)=(void(*)(address addr, uint64_t offset))(void *)a->emit_fd(); + uint32_t *code = (uint32_t *)a->pc(); + // Don't use R0 in ldarx. + // keep R3_ARG1 = R3 unmodified, it contains &field (see below) + // keep R4_ARG2 = R4 unmodified, it contains offset = 0 (see below) + a->fsqrt(F3, F4); // code[0] -> fsqrt_m + a->isel(R7, R5, R6, 0); // code[1] -> isel_m + a->ldarx_unchecked(R7, R3_ARG1, R4_ARG2, 1);// code[2] -> lxarx_m + a->cmpb(R7, R5, R6); // code[3] -> bcmp + //a->mftgpr(R7, F3); // code[4] -> mftgpr + a->popcntb(R7, R5); // code[5] -> popcntb + a->popcntw(R7, R5); // code[6] -> popcntw + a->fcfids(F3, F4); // code[7] -> fcfids + a->vand(VR0, VR0, VR0); // code[8] -> vand + a->blr(); + + // Emit function to set one cache line to zero + void (*zero_cacheline_func_ptr)(char*) = (void(*)(char*))(void *)a->emit_fd(); // emit function descriptor and get pointer to it + a->dcbz(R3_ARG1); // R3_ARG1 = R3 = addr + a->blr(); + + uint32_t *code_end = (uint32_t *)a->pc(); + a->flush(); + + // Print the detection code. + if (PrintAssembly) { + ttyLocker ttyl; + tty->print_cr("Decoding cpu-feature detection stub at " INTPTR_FORMAT " before execution:", code); + Disassembler::decode((u_char*)code, (u_char*)code_end, tty); + } + + // Measure cache line size. + memset(test_area, 0xFF, BUFFER_SIZE); // fill test area with 0xFF + (*zero_cacheline_func_ptr)(mid_of_test_area); // call function which executes dcbz to the middle + int count = 0; // count zeroed bytes + for (int i = 0; i < BUFFER_SIZE; i++) if (test_area[i] == 0) count++; + guarantee(is_power_of_2(count), "cache line size needs to be a power of 2"); + _measured_cache_line_size = count; + + // Execute code. Illegal instructions will be replaced by 0 in the signal handler. + VM_Version::_is_determine_features_test_running = true; + (*test)((address)mid_of_test_area, (uint64_t)0); + VM_Version::_is_determine_features_test_running = false; + + // determine which instructions are legal. + int feature_cntr = 0; + if (code[feature_cntr++]) features |= fsqrt_m; + if (code[feature_cntr++]) features |= isel_m; + if (code[feature_cntr++]) features |= lxarxeh_m; + if (code[feature_cntr++]) features |= cmpb_m; + //if(code[feature_cntr++])features |= mftgpr_m; + if (code[feature_cntr++]) features |= popcntb_m; + if (code[feature_cntr++]) features |= popcntw_m; + if (code[feature_cntr++]) features |= fcfids_m; + if (code[feature_cntr++]) features |= vand_m; + + // Print the detection code. + if (PrintAssembly) { + ttyLocker ttyl; + tty->print_cr("Decoding cpu-feature detection stub at " INTPTR_FORMAT " after execution:", code); + Disassembler::decode((u_char*)code, (u_char*)code_end, tty); + } + + _features = features; +} + + +static int saved_features = 0; + +void VM_Version::allow_all() { + saved_features = _features; + _features = all_features_m; +} + +void VM_Version::revert() { + _features = saved_features; +}